cc/client/client_session.h: Single-parameter constructor should be marked explicit
diff --git a/tensorflow/cc/client/client_session.h b/tensorflow/cc/client/client_session.h
index 3765eae..a661319 100644
--- a/tensorflow/cc/client/client_session.h
+++ b/tensorflow/cc/client/client_session.h
@@ -64,7 +64,7 @@
   ClientSession(const Scope& scope, const string& target);
 
   /// Same as above, but use the empty string ("") as the target specification.
-  ClientSession(const Scope& scope);
+  explicit ClientSession(const Scope& scope);
 
   /// Create a new session, configuring it with `session_options`.
   ClientSession(const Scope& scope, const SessionOptions& session_options);